Logging-engine.



A. DUNBAR.

' LOGGING ENGINE.

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Patented Aug. 3, 1909.

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LOGGING ENGINE.

APPLICATION rum) nnc.7,19oa.

Patented Aug. 3, 1909.

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Inventor:

Witnesses Attorneys A. DUNBAR.

LOGGING ENGINE.

APPLICATION TILED 1030.7,1908.

929,662. Patented Aug.3.1909.

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ALEXANDER DUNBAR, OF WOODSTOCK, NEW BRUNSWICK, CANADA.

LO GGING-ENGINE.

Specification of Letters Patent.

Application filed December 7, 1908.

Patented Aug. 3, 1909.

Serial No. 466,276.

To all whom it may concern:

Be it known that I, ALEXANDER Duncan, a subject of the King of Great Britain, residing at \Voodstock, county of Carleton, in the Province of New Brunswick, Canada, have invented certain new anduseful Improvements in Logging-Engines; and I do hereby declare that the following is a full, clear, and exactdescriptionof the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The invention to be hereinafter described relates to logging engines, and more particularly to a means for raising or lowering the forward part of the engine boiler as the engine goes down or up a grade, respectively.

As heretofore built, loggingengines, in traveling up or down grades, have been at a serious disadvantage, due to the fact that the water in the boiler hassettled toward one or the other of the ends of the same, thus leaving the tubes at the opposite end uncovered. Besides this primary objection, several others of considerable importance have been met. One of these is the liability of the forward or guide runners to slide laterally when the engine becomes canted to one side. These runners are flat and smooth, and there is nothing to afford them a grip on the packed snow over which the engine is driven in the winter. It sometimes happens that there are straight stretches of the logging road over which very little attention to the steering gear is needed. In such instances, however, according to prior constructions, the driver must be at the steering wheel regardless of the character of the road. Then again, many sections of. the road will be found very uneven. This unevenness of the roads has a very injurious effect on the known constructions of logging engines, because they cannot adapt themselves to such irregularities. It is with an idea to overcoming these main objections and many other minor objections, that the present invention has been designed.

In order to more clearly disclose the construction, operation and use of the invention, reference should be had to the accompanying drawings forming partof the present application.

Throughout the drawings like reference characters designate the same parts.

In the drawings: Figure 1 is a side elevation of the forward part of the engine, partly raised; Fig. 2 is a front elevation of Fig. 1; Fig. 3 is an enlarged central vertical section through the mechanism for raising the engine boiler; Fig. 4 is a plan view of the 0 steering gears; Fig. 5 is a section on line 5-5 of Fig. 3; Fig. 6 is a vertical cross section through the central knuckle; Fig. 7 is a front view of the engine and. its raising mechanism, with the engine boiler raised;

Fig.8 is a partial vertical longitudinal section of one of the runners; and Fig. 9 is a cross section on line 9-9 of Fig. 8.

Any well known frame or support may be used for the engine and boiler, which, also,

may be of usual construction. The forward end of this main frame is supported on runners formed of angle irons spaced slightly apart at their longitudinal centers, for a purpose to be later disclosed. These runners are coupled together by a plurality of struts or braces 1. At the center of these struts is mounted a coupling block 4: to which is pivotally attached, by a pivot pin 5, a yoke 2, which is fixed to the lower end of a piston rod 3. The upper end of this rod is notched to receive a wedgeshaped block 7, projecting from the lower face of a piston block 8. Between the block 7 and the bottom of the notch may be interposed any suitable antifriction device or material. The notch also serves as an oil cup for the loose connections between the piston block and the piston rod. The piston block 8, as a whole, comprises a main section consisting of a circular disk having a centrally extended cylindrical portion, and an annular disk of the same diameter as the first disk, but provided with an opening adapted to receive the cylindrical portion of the first disk so that it may be ad justed toward or from the first disk. Such adjustment, of course, acts to vary the thick ness or depth of the piston block, as a whole, and consequently makes it possible to adjust such thickness so as to avoid any possibility of bindin between the piston block and the interior of the cylinder. This piston block is adapted to slide within a cylinder 9, provided with inlet and exhaust ports 10 and 11.

respectively. The exhaust port is placed a low as to have it engage the bottom of the cylinder. The iston is operated, of course, by admission 0 fluid to the cylinder above the piston block, or exhaust of the same therefrom, as may be desired, This fluid should be a difticultly freezable substance, such as glycerin or the like. In the preferred form of the machine, this fluid iscarried in-a tank at the rear of the engine and is delivered to and from the piston cylinder through suitable pipes controlled by valves within reach of the engineer.

The adjustment of theannular disk of the piston block may be 'efie'cted by threaded bolts 01' screws passing 'therethrough and takinginto the main dish of the piston block. In ordertoinsure'a snug fit between the c'up washer of the .piston block and the cylinder face, the annular disk'may be perforated an'dthe upturned flange of the main disk may belsimil'arly' perforated, thus allowing the Lfluid 7 above the piston to; pass through the piston and into direct cont'act with the face of'the cup washer, forcing'it against the cylinder wall at alltimes. 5

fin order to steerthe en'gine,:it is necessary, of course,'to rotate the'p1ston'rod3, tow hlch are connected the forward or guide runners.

7 Such rotation iseti'ec ted through'a segment gear 12, "which is 'detach'ably secured to a rotate with it.

.l'lange of a: sleeve 13, which is 'let into a casing on the forwai'dpart of the'fraine. This sleeve is provided "with akey-wa'y adapted to slidingly receive a longitudinal feather l4. Thus, the piston rod may nifove verti cally throughfthe, sleeve, but is forced. to I For inovingfthe segment gear, "several interin'etliate' gear's and-fa hand wheel 15 may be used. Theshaft of-tliis hand wheel passes through a. split sleeve 16,

I which'nray be tightened by a thumb nut 17,

or like means, hen thus tightenedpthe shaft of the steering wheelfand, conse q'uently, the forward runners, wlllbe tightl'ylocked against movement. .Of'co'urs e, the

split sleeve 16 may be tightenedjust sufficiently to brake'the move'inent of therunners. The pivotpin 5 connecting the lower endof the-piston rod 3 with the block .4 at

thebenter of thestruts, acts as a knuckle,

allowing a runner 'on'one side of-the engine to assume higher or a lower position than that of the runner on the opposite side of the engine. When the road is 'veryirregular, it will be desirable to-providemeans whereby the opposite ends of each runner 'may be raised or lowered from the normal hori- *zontallevel. To this end, each runner is connected by a, pivot pin or knuckle 18, to a o block carried in the outer end of the struts '1. In this way, the runners have individual rocking movement to and fro of their lengths and bodily vertical movementrrelatively to the lowerend of the piston rod 3.

Each of the runners is formed of two angle irons spaced apart at their longitu-p' dinal centers to form "a slot or passage, in which is seated a keel 19, which .pro e'cts slightly belowthe face of the runner. lhe r upper edge of this keel rests against set screws'20, by which it may be adjusted, as desired. 'lh'e keel cuts'into th'ejsurf'a'ce over which the runners are 'forc'ed, and catches a hold, which prevents side slipping runners. A

It is thou'ghitthat theoperation and use of 'the machine and its several 7 parts will be clear from the preceding detailed description.

Changes may be'm'ade in the construction,

of the scribed, the, combination comprising a frame,

an engine mounted thereon, a cylinder on. said frame, a piston block reclprocably mounted insaid cylinder, a sleeve reciprocably mounted in the aforesaid frame and provided wlth a segment gear and a keyway, a piston rod shdably mountedln sald sl'eeve'and-provided with a feather adapted V to beseated withinsaid key-way, and adapted to be actuated by the aforesaid piston block, runners for supporting the forward endof the aforesaid frame, connections'be tween said runners and 'saidpiston'rod, and means for rotat ng the aforesaid sleeve to steer the'englne.

Inwitness'whereof'I have hereunto set my 7 hand in the presence of two witnesses.

' Witnesses:

J. NORMAN W. WVINsLoW, Gr.'L. BALM I'N.

ALEXANDER 'DUNBAR. 

